erspan: get the proto with the md version for collect_md

In commit 20704bd1633d ("erspan: build the header with the right proto
according to erspan_ver"), it gets the proto with t->parms.erspan_ver,
but t->parms.erspan_ver is not used by collect_md branch, and instead
it should get the proto with md->version for collect_md.

Thanks to Kevin for pointing this out.

Fixes: 20704bd1633d ("erspan: build the header with the right proto according to erspan_ver")
Fixes: 94d7d8f29287 ("ip6_gre: add erspan v2 support")
Reported-by: Kevin Traynor <ktraynor@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index a4ecfc9d25930967a6af7bd9de9aa52bfd08730d..da80974ad23aeb9751e325b28f0dc293f48bf6a1 100644 (file)
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -1015,12 +1015,14 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
                                            ntohl(tun_id),
                                            ntohl(md->u.index), truncate,
                                            false);
+                       proto = htons(ETH_P_ERSPAN);
                } else if (md->version == 2) {
                        erspan_build_header_v2(skb,
                                               ntohl(tun_id),
                                               md->u.md2.dir,
                                               get_hwid(&md->u.md2),
                                               truncate, false);
+                       proto = htons(ETH_P_ERSPAN2);
                } else {
                        goto tx_err;
                }
@@ -1043,24 +1045,25 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
                        break;
                }
 
-               if (t->parms.erspan_ver == 1)
+               if (t->parms.erspan_ver == 1) {
                        erspan_build_header(skb, ntohl(t->parms.o_key),
                                            t->parms.index,
                                            truncate, false);
-               else if (t->parms.erspan_ver == 2)
+                       proto = htons(ETH_P_ERSPAN);
+               } else if (t->parms.erspan_ver == 2) {
                        erspan_build_header_v2(skb, ntohl(t->parms.o_key),
                                               t->parms.dir,
                                               t->parms.hwid,
                                               truncate, false);
-               else
+                       proto = htons(ETH_P_ERSPAN2);
+               } else {
                        goto tx_err;
+               }
 
                fl6.daddr = t->parms.raddr;
        }
 
        /* Push GRE header. */
-       proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
-                                          : htons(ETH_P_ERSPAN2);
        gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
 
        /* TooBig packet may have updated dst->dev's mtu */